The Districts' 1,400 miles of main trunk sewers and 11 wastewater treatment plants convey and treat about 400 million gallons per day (mgd) of wastewater, of which approximately 140 mgd are available for reuse in the dry Southern California climate.

Regional Recycled Water ProgramThis link provides information on the joint Metropolitan Water District of Southern California and Sanitation Districts’ Regional Recycled Water Program.

Service Areas

Joint Outfall System

Seventeen of the Sanitation Districts that provide sewerage services in the metropolitan Los Angeles area south of the San Gabriel Mountains are signatory to a Joint Outfall Agreement that provides for operation and maintenance of a regional, interconnected system of facilities known as the Joint Outfall System (JOS).The service area of the JOS encompasses 73 cities and unincorporated territory, and includes some areas within the City of Los Angeles, Orange County and San Bernardino County.

The JOS provides wastewater collection, treatment, reuse, and disposal for residential, commercial, and industrial users, and includes the following treatment plants:

Sanitation Districts Nos. 14 and 20 service areas are in the Antelope Valley. Sanitation District No. 14 serves the Cities of Palmdale and Lancaster, along with unincorporated territory, and operates the Lancaster WRP. Sanitation District No. 20 serves the City of Palmdale and unincorporated territory and operates the Palmdale WRP.